| Registro completo |
| Provedor de dados: |
Genet. Mol. Biol.
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| País: |
Brazil
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| Título: |
A new method to estimate genetic gain in annual crops
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| Autores: |
Breseghello,Flávio
Morais,Orlando Peixoto de
Rangel,Paulo Hideo Nakano
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| Data: |
1998-12-01
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| Ano: |
1998
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| Resumo: |
The genetic gain obtained by breeding programs to improve quantitative traits may be estimated by using data from regional trials. A new statistical method for this estimate is proposed and includes four steps: a) joint analysis of regional trial data using a generalized linear model to obtain adjusted genotype means and covariance matrix of these means for the whole studied period; b) calculation of the arithmetic mean of the adjusted genotype means, exclusively for the group of genotypes evaluated each year; c) direct year comparison of the arithmetic means calculated, and d) estimation of mean genetic gain by regression. Using the generalized least squares method, a weighted estimate of mean genetic gain during the period is calculated. This method permits a better cancellation of genotype x year and genotype x trial/year interactions, thus resulting in more precise estimates. This method can be applied to unbalanced data, allowing the estimation of genetic gain in series of multilocational trials.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000400024
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| Editor: |
Sociedade Brasileira de Genética
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| Relação: |
10.1590/S1415-47571998000400024
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| Formato: |
text/html
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| Fonte: |
Genetics and Molecular Biology v.21 n.4 1998
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| Direitos: |
info:eu-repo/semantics/openAccess
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